先請看?Object.observe 的 API

Object.observe(obj, callback[, acceptList])

它用來監(jiān)聽對象的變化，當給該對象添加屬性，修改屬性時都會被依次記錄下來

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看一個示例

var person = {} Object.observe(person, function(arr) {var change = arr[0]console.log(change.type, change.name, change.oldValue) })

在 chrome 控制臺里修改 person

可以看到給 person 添加、修改和刪除屬性都沒記錄下來了。這個 person 可以看出是 MV* 里的 Model，當數(shù)據(jù)模型發(fā)生變化的時候，通過 Object.observe 的回調(diào)就能方便的監(jiān)聽，通知 View。

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這是一個強大的功能，可以實現(xiàn)很多MV*庫里的 “雙向綁定”，比如?Angular，Knockout。有了它不必自己去寫一套觀察者代碼，可惜ES7最終將它放棄。

Over three years ago, Rafael Weinstein, Erik Arvidsson, and I set out to design and implement what we believed to be the primitive underlying the data-binding system of MDV ("model-driven views"). We prototyped an implementation in a branch of V8, then got agreement from the V8 team to build a real version upstream, while pushing Object.observe ("O.o") as a part of the upcoming ES7 standard and working with the Polymer team to build their data-binding system on top of O.o.Three years later, the world has changed in a variety of ways. While other data-binding frameworks (such as Ember and Angular) showed interest, it was difficult to see how they could evolve their existing model to match that of O.o. Polymer rewrote from the ground up for its 1.0 release, and in that rebuilding did not utilize O.o. And React's processing model, which tries to avoid the mutable state inherent in data-binding systems, has become quite popular on the web.After much discussion with the parties involved, I plan to withdraw the Object.observe proposal from TC39 (where it currently sits at stage 2 in the ES spec process), and hope to remove support from V8 by the end of the year (the feature is used on 0.0169% of Chrome pageviews, according to chromestatus.com).For developers who have been experimenting with O.o and are seeking a transition path, consider using a polyfill such as https://github.com/MaxArt2501/object-observe or a wrapper library like https://github.com/polymer/observe-js.

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相關(guān)：

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/observe

https://github.com/polymer/observe-js

https://github.com/MaxArt2501/object-observe

https://mail.mozilla.org/pipermail/es-discuss/2015-November/044684.html

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